Thread: Chevette blues

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it's also tempting to fix it factory correct.

This is the first vintage vehicle I have ever come across which is absolutely 100% intact, every vacuum line is still there, nothing has been removed or bypassed, that is just so rare! And the challenge of learning this obsolete technology is endearing. However I just might draw the line at the ECM.

I've confirmed voltage to the TPS, checked the TPS for function, replaced the 02 sensor, and plugged in the temp sensor (oops) and still running in open loop.

I have a NOS carb base gasket but without the heater grid, I might try that next. The old base gasket really looks like kaka. A vacuum leak can mimmick a lean condition and cause the ECM to hold open loop function.